Discovery of a Nonblazar Gamma-Ray Transient Source Near the Galactic Plane: GRO J1838−04 | Zendy

M. Tavani | Zendy; R. Mukherjee | Zendy; J. R. Mattox | Zendy; J. P. Halpern | Zendy; D. J. Thompson | Zendy; G. Kanbach | Zendy; W. Hermsen | Zendy; ShuangNan Zhang | Zendy; Roger S. Foster | Zendy

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Discovery of a Nonblazar Gamma-Ray Transient Source Near the Galactic Plane: GRO J1838−04

Author(s) -

M. Tavani,

R. Mukherjee,

J. R. Mattox,

J. P. Halpern,

D. J. Thompson,

G. Kanbach,

W. Hermsen,

ShuangNan Zhang,

Roger S. Foster

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310603

Subject(s) - egret , physics , astrophysics , galactic plane , blazar , pulsar , sky , gamma ray , photon , astronomy , active galactic nucleus , flux (metallurgy) , galaxy , optics , materials science , metallurgy

We report the discovery of a remarkable gamma-ray transient source near theGalactic plane, GRO J1838-04. This source was serendipitously discovered byEGRET in June 1995 with a peak intensity of 4 E(-6) ph/cm/cm/s (for photonenergies larger than 100 MeV) and a 5.9 sigma significance. At that time, GROJ1838-04 was the second brightest gamma-ray source in the sky. A subsequentEGRET pointing in late September 1995 detected the source at a flux smallerthan its peak value by a factor of 7. We determined that no radio-loudspectrally-flat blazar is within the error box of GRO J1838-04. We discuss theorigin of the \ggg-ray transient source and show that interpretations in termsof AGNs or isolated pulsars are highly problematic. GRO J1838-04 providesstrong evidence for the existence of a new class of variable gamma-ray sources.Comment: 15 pages, 4 postscript files with figures Accepted for publication in Astrophys. J. Letters, Feb. 3, 199

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